Seattle police homicide investigators searched Thursday for a

shooter in the New Year’s Eve slaying of a longtime Seattle Public Utilities employee.

Stephen Jeffries, 40, was at a house party in the 9200 block of 16th Avenue Southwest when he and a 33-year-old woman who lived at the home were shot, according to police. Jeffries was taken to Harborview Medical Center and later died of the two gunshot wounds; the woman suffered minor injuries and survived.

Police said they’re chasing leads and weren’t certain of a motive.

Jeffries is the brother of a man who died after being shot outside a White Center house party in January 2002. The gunman in that case was never prosecuted due to the claim that the killing was done in self-defense.

Stephen Jeffries was present at the same party where his brother, William Jeffries, was slain, according to published reports.

Andy Ryan, spokesman for Seattle Public Utilities, said Thursday that Stephen Jeffries worked in the field for the city agency’s drainage and wastewater operations.

His mother, Michelle Jeffries Cherry, told KIRO 7 that her son is survived by four daughters, ages 3 to 22. Relatives told the news station that Jeffries got into an argument at the house party and was shot when he tried to leave. Relatives said they did not know another man involved in the argument.

News researcher Miyoko Wolf contributed to this report.

Jennifer Sullivan: 206-464-8294 or jensullivan@seattletimes.com. On Twitter @SeattleSullivan.