Italy has lifetime prison for the equivalent of first-degree murder, though actually after 30 years you can get parole and after 20 years you can get out during the day for work ("semilibertà"). Lifetime without parole is only given in combination with mafia crimes.

But it's very rarely the case that someone gets lifetime with parole, as your penalty is reduced by 1/3 if you are okay with having your sentence decided by the judge right at the preliminary hearing. In that case you can get 30 years for first-degree murder, with parole after 20 years and semilibertà after 15 years.

This doesn't apply if you are declared "totally mentally incapable". In that case you don't get a normal sentence, instead you are subject to involuntary treatment which could possibly last for life.

Life in prison without the option of parole. Or, if the murder was caused by something like a psychotic episode or drug withdrawal, therapy in a closed facility.

What most of western countries do. Limited prison time and help for recovery.