04/19/2017 02:42 EDT | Updated 04/19/2017 02:55 EDT

Morrison Lampley Gets 100 Years To Life For Killing Audrey Carey And Steve Carter

Morrison Lampley was one of three people who admitted to killing Audrey Carey and Steve Carter in 2015.

SAN FRANCISCO — A transient who pleaded guilty to killing a Canadian tourist in a San Francisco park and a yoga teacher walking his dog on a popular hiking trail has been sentenced to 100 years to life in prison.

Morrison Lampley was one of three people charged with first-degree murder in the 2015 killings.

Lila Alligood was sentenced to 50 years to life, while accomplice Sean Angold got 15 years. Angold received the lesser sentence for agreeing to testify against the others.

The trio admitted killing Audrey Carey, 23, of Saint-Jean-sur-Richelieu, Que., while she was camping in Golden Gate Park and attending the annual Hardly Strictly Bluegrass Festival.

A combination photo of Sean Angold, Lila Alligood, and Morrison Lampley, are shown in these police booking photos provided by Multnomah County Sheriff's Office in Portland, Oregon, October 9, 2015. (Photo: Multnomah County Sheriff's Office/Handout via Reuters)

Steve Carter, 67, was killed two days later in Marin County north of San Francisco.

The San Francisco Chronicle reports that Carey's mother, Isabelle Tremblay, said "She trusted you, you three unspeakable monsters,'' in a statement read by a Marin County prosecutor.

Court testimony showed the trio befriended Carey while she was camping but robbed her and stole her camping gear. Her body was found in the park on Oct. 3, 2015.

— With files from The Canadian Press