SOUTH LAKE TAHOE, Calif.—A man convicted of killing three California teenagers in the 1980s has been sentenced to death.

Lake Tahoe News reports a jury in South Lake Tahoe imposed the death penalty against 62-year-old Joseph Michael Nissensohn after deliberating for about 90 minutes Tuesday.

Nissensohn was convicted of three counts of first-degree murder for the 1989 killing of 15-year-old Kathy Graves of South Lake Tahoe, as well as the 1981 slayings of 13-year-old Tammy Jarschke and 14-year-old Tanya Jones of Monterey County.

He had served 15 years in prison for a murder in Washington state and was nearing release in 2008 when prosecutors in Monterey and El Dorado counties combined their cases and filed charges in the deaths of the teenagers.

Nissensohn is scheduled to be formally sentenced March 18.