A New Hampshire man has been sentenced to 15 to 30 years in prison for a wrong-way crash that killed a retired Massachusetts police sergeant and his wife in January.

Thirty-one-year-old Ryan Kittredge, of Derry, was sentenced Friday, three weeks after he pleaded guilty to manslaughter and reckless conduct. He was accused of driving drunk and making a U-turn on Route 101 in Epping, causing a three-vehicle crashed that killed John and Heidi Johnson, of New Ipswich. Johnson had recently retired after nearly four decades with the Townsend, Massachusetts, Police Department.

Kittredge could shave 2 1/2 years off the 15 years if he completes a substance misuse treatment program.

In a lengthy letter to the victims’ family, Kittredge apologized and said he wants to make amends by encouraging others to  seek sobriety.