UPDATE: Elderly Couple Killed in Their Renton Home; Search on for Grandson

UPDATE: 12:40 a.m. Sunday:  Detectives confirmed they are searching for the grandson of the elderly Fairwood couple who were found dead in their Renton home Saturday evening.

King County Sheriff's spokeswoman Cindi West said Michael Boysen, 26, is not wanted in connection with the double homicide. He is believed to have seen the couple Friday night and remains unaccounted for, West said. His connection to the crime is unknown, she added.

He is described as a while male, 5'10" and 170 pounds.

Original story:

King County Sheriff's investigators confimed Saturday they are looking into the possible slaying of an elderly couple in their Renton home.

The bodies of the couple--he was 80 years old and his wife was 82--were found by their daughter at 7 p.m. Saturday, said Cindi West, spokeswoman for the sheriff's deparment.

The couple lived on the 16200 block of 145th Ave. S.E., in the Fairwood Greens Community of the Fairwood Golf and Country Club.

"Another relative had stopped by around noon (Saturday)," West said. "When the couple didn't answer the door, this person called the daughter, who came over around 7."

She also knocked and didn't get an answer. When she let herself in, she found the couple already dead. West said investigators didn't have many additional details except that the deaths are considered "suspicious" and the couple's Chrysler is missing.

The King County Sheriff's Office asks that anyone who sees a red, 2001 Chrysler 300, Washington license plate 046-XXU, please call 911.

West said the couple was last seen alive at 10 p.m. Friday night. Investigators did not yet reveal a cause of death.

Look here at Renton Patch for additional updates Saturday night and Sunday morning.