Negligent Homicide in Spain (Art. 142 CP): Gross vs Less Serious, Prison or Fine

Few criminal proceedings are as painful for everyone involved as those that arise from a death nobody intended. The driver who has a fatal lapse of attention, the employer at whose site a deadly accident occurs, the professional whose mistake has irreparable consequences: none of them set out to kill, yet all of them can end up charged with negligent homicide. Article 142 of the Spanish Criminal Code (CP) is the provision that punishes causing another person's death without intent, through careless conduct. And the most important part of the defence is decided inside that single article: if the negligence is classified as gross, there is a risk of prison; if it is less serious, the penalty is limited to a fine. As criminal defence lawyers experienced in negligent homicide, we explain where that line falls and how it is worked.

What negligent homicide is

Negligent homicide is defined not by its result — the death — but by the way the person acted. Unlike intentional homicide (art. 138 CP), where the offender wants to kill or accepts that possibility, in the negligent form there is no will to cause death: there is a breach of the duty of care that, avoidably, ends in a fatality. The criminal reproach does not fall on intent, which is absent, but on the negligence: the person should have foreseen the danger and could have, yet did not avoid it.

To secure a conviction, the prosecution must prove three elements: conduct that breaches a duty of care, a resulting death, and a causal link between the two, such that the death is precisely the materialisation of the risk the breached rule was meant to prevent. If any of these links is missing — for instance, if the death would have occurred anyway without the careless conduct — there is no offence.

Gross negligence: 1 to 4 years in prison

Article 142.1 CP punishes whoever causes the death of another through gross negligence with imprisonment of one to four years. Gross negligence is the breach of the most basic duties of care, those that even the least diligent person would observe. On top of that base penalty, the provision adds specific consequences depending on the context:

• If the homicide is committed with a motor vehicle or moped, the court also imposes a ban on driving motor vehicles and mopeds of one to six years.
• If the homicide is committed through professional negligence — that of the doctor, the architect, the carrier or any other professional who breaches the lex artis of their trade — the court also imposes special disqualification from the profession, trade or office for three to six years.

One clarification reassures many clients: a prison sentence not exceeding two years, for a first offence, can be suspended where the requirements of article 80 CP are met. In practice, a conviction for death by gross negligence in a road accident, with no prior record and with the harm repaired, rarely ends in actual imprisonment — though it does usually entail losing the licence for a meaningful period.

Less serious negligence: only a fine

Article 142.2 CP provides for a lower tier: where the death results from less serious negligence, the penalty is a fine of three to eighteen months, with no prison. If the acts were committed with a motor vehicle or moped, a driving ban of three to eighteen months is added. The gap from the previous paragraph is enormous: it moves from risking prison to facing a purely financial penalty.

This form also carries a decisive procedural feature: it is prosecutable only on the complaint of the injured party or their legal representative. It is not a public offence that the Public Prosecutor pursues of its own motion; it requires the impetus of those harmed. Where the injured party (or, in a fatality, those entitled to act in their place) chooses not to file a complaint, the case simply does not proceed. In certain cases this opens the door to a reparation agreement that prevents or ends the proceedings before they reach trial.

The line between gross and less serious

This is where the real legal battle is fought. The law sets no closed list: the classification turns on the importance of the duty of care breached and on the degree of foreseeability and avoidability of the outcome. The Supreme Court requires the whole set of circumstances to be weighed — the dangerousness of the conduct, the intensity of the breach, the trust the agent could place in the conduct of others — in order to place the case at one level or the other.

There is, however, one situation in which the law itself closes the debate. Article 142 CP deems it gross negligence to drive a motor vehicle or moped where one of the circumstances of article 379 CP is present: driving under the influence of drugs or with blood alcohol levels above the criminal threshold, or at a speed notably higher than the legal limit. In those cases the gravity of the negligence is imposed by statute, and the defence must shift to other fronts (causation, proof of impairment or of the alcohol level, the contribution of fault by others).

Negligent homicide versus dolus eventualis

Not every extremely risky act is negligent. There is a grey zone — of great consequence, because it changes the penalty entirely — between conscious negligence and dolus eventualis (conditional intent). In conscious negligence, the person perceives the danger but genuinely trusts that the result will not occur; in dolus eventualis, they picture the result as probable and nonetheless accept it or are indifferent to it, which turns the act into intentional homicide punishable with 10 to 15 years (art. 138 CP).

The distinction is subtle and decided case by case: driving the wrong way at high speed, firing towards a group of people, or undertaking a reckless manoeuvre in a crowded setting may be assessed as dolus eventualis. Showing that the accused trusted in avoiding the result — rather than accepting it — is one of the most important lines of defence when the prosecution seeks to raise the facts to intentional homicide.

Civil liability: the traffic scale and insurers

Alongside the penalty, every negligent homicide generates civil liability: the duty to compensate those harmed by the death (spouse, children, ascendants and other close relatives). In road traffic incidents that compensation is quantified under the official traffic scale (the baremo), which sets fixed amounts for personal and financial loss. As a rule, the vehicle's insurer meets those sums within the limits of the compulsory and voluntary cover.

For the person under investigation, handling this aspect well matters for two reasons. First, because repairing the harm is a mitigating circumstance (art. 21.5 CP) that can reduce the penalty. And second, because compensation accepted by those harmed can pave the way for agreements — including a plea agreement — that close the proceedings on more predictable terms.

Defence lines in negligent homicide

Every case is different, but these are the avenues we examine most often:

• Challenging the classification of the negligence. Reclassifying the facts from gross to less serious is almost always the central goal: it swaps prison for a fine.
• Attacking causation. If the result would have occurred anyway, or a decisive external factor intervened, the objective attribution of the result breaks down.
• Assessing contributory fault. The involvement of the victim or a third party in causing the accident can temper both criminal and civil liability.
• Technical expert evidence. Accident reconstruction, speed reports, biomechanics, or analysis of the lex artis in professional and medical cases.
• Repairing the harm and mitigating factors. Compensation, confession and undue delay as circumstances that improve the accused's position.

The Supreme Court is demanding when it comes to reasoning the gravity of the negligence, and any shortfall in that reasoning is a ground for challenge. Handling this offence with technical rigour, and with the sensitivity a case involving a person's death demands, makes the difference to the outcome of the proceedings.

Specialist defence in Madrid and across Spain

Alonso Sala is a firm dedicated exclusively to criminal law, based at Velázquez 27, Madrid, with coverage throughout Spain. We take on the defence in negligent homicide proceedings — road accidents, workplace fatalities and professional negligence — attending both to the technical strategy and to the support these cases call for. If you are facing a charge of this kind, you can contact the firm so that we can review your situation.