William L. "J.R." Phillip was convicted of murder in April and sentenced Friday at the King County Regional Justice Center in Kent.
Phillip stabbed 41-year-old Seth Frankel to death in May of 2010 at his apartment in Auburn.
"We will never see Seth again," said Richard Frankel. "Never enjoy his warm and loving personality."
In court Friday, family members described Frankel as a man passionate about his work as a video producer for the city of Kent and a loving father dedicated to raising his 2-young daughters.
"It is unfathomable to think one's child has died because someone decided that they should no longer live," Richard Frankel said.
Police found Seth Frankel stabbed inside his home that he shared with his girlfriend, who investigators say also dated the suspect for a brief time in Portland before calling it off and moving north.
Prosecutors say Phillip wanted his ex-girlfriend back, so he drove to Auburn and brutally attacked Frankel
Police linked Phillip to the murder through cell phone records and DNA collected at the scene.
Phillip didn't show any emotion nor said any words during his sentencing.