CONCORD, N.H. (AP) - The New Hampshire Supreme Court says four of the state's most notorious young killers should receive new sentencing hearings in light of a 2012 U.S. Supreme Court ruling that mandatory life sentences for juvenile killers are unconstitutional.

The New Hampshire court's unanimous ruling, released Friday, mandates new sentencing hearings for Robert Tulloch, Robert Dingman and two other convicted killers who were under the age of 18 when they killed their victims.

Tulloch stabbed to death two Dartmouth professors in 2001. Dingman killed his parents in 1996 rather than abide by curfews and other house rules.

Prosecutors argued that the 5-4 U.S. Supreme Court ruling should not be applied retroactively, but the state's highest court disagreed.

Lawyers for the four say their clients were children and lesser sentences should be considered.