SACRAMENTO, Calif. (AP/CBS13) — The man accused of strangling Roger Kibbe, the California serial killer known as the “I-5 Strangler,” to death won’t face the death penalty, a prosecutor said Wednesday.

Amador County District Attorney Todd Riebe said he had filed first-degree murder charges against Jason Budrow and will seek a sentence of life in prison without the possibility of parole, the Sacramento Bee reported.

READ MORE: Sacramento County Tackles Zip Code Vaccine Disparities

Budrow, 40, is accused of strangling Kibbe, whose body was discovered on Feb. 28 in their shared cell at Mule Creek State Prison southeast of Sacramento.

Kibbe’s victims’ families told CBS13 that his death was deserved.

“I don’t have any sympathy for him at all,” said Carl Burleigh, who’s sister Lou Ellen Burleigh was Kibbe’s first known murder victim in 1977.

Budrow already is serving life without parole for strangling his then-girlfriend in 2011 in Riverside County.

Death penalty cases are costly and lengthy affairs that include automatic appeals. California hasn’t executed anyone since 2006 and Gov. Gavin Newsom has issued a moratorium on capital punishment while he is in office.

Kibbe, 81, was initially convicted in 1991 of strangling Darcine Frackenpohl, a 17-year-old who had run away from her home in Seattle. Her nearly nude body was found west of South Lake Tahoe below Echo Summit in September 1987.

READ MORE: Feds' Boogaloo Indictment Details Inside of Northern California Extremist Group

Investigators said then that they suspected him in other similar slayings.

But it wasn’t until 2009 that a San Joaquin County District Attorney’s Office investigator used new developments in DNA evidence to connect him to additional slayings in Northern California counties.

Kibbe pleaded guilty to six additional killings in exchange for prosecutors not seeking the death penalty.

Those victims were Lou Ellen Burleigh, 21, in 1977 and Stephanie Brown, 19; Lora Heedrick, 20; Katherine Kelly Quinones, 25; Charmaine Sabrah, 26; and Barbara Ann Scott, 29, all in 1986.

Kibbe was serving multiple life terms without possibility of parole when he was killed.

In a letter to The Mercury News last month, Budrow said he killed Kibbe on the same day they became cellmates, initially so he would have a cell to himself.

MORE NEWS: Stockton Teen, 14, Shot While Driving Left Paralyzed

“What had started out as my original bare-bones plan of doing a straightforward homicide of a cellmate to obtain my single-cell status evolved into a mission for avenging that youngest girl and all of Roger Kibbe’s other victims,” he wrote.