Two in a group of three drifters, Morrison Lampley and Lila Alligood, pleaded guilty today to two first-degree murders over the course of a meth-fueled weekend in 2015. Sources including the Examiner and NBC Bay Area reported the pleas and say that the two will be sentenced at a later, as-yet-undetermined date — she to anywhere from 50 years to life in state prison and he to 100 years to life in prison, as he was the gunman. The death penalty was not sought. The third defendant in the case, Sean Angold, pleaded guilty last May and turned state's witness, agreeing to testify under an immunity grant in exchange for a 15 years to life state prison sentence on one count of second-degree murder.

The trio of drifters, the couple of Lampley and Alligood up from San Diego, and Angold, 25, a meth user and dealer they met in the Upper Haight, murdered a young Canadian backpacker, Audrey Carey, in Golden Gate Park during the 2015 Hardly Strictly Bluegrass festival. They had initially befriended her, but then, with a vague plan to rob her, they killed her: She was found tied up with pot and meth in her system.

Two days later, Steve Carter, a tantric yoga instructor caring for his sick wife, was found shot dead on a hiking trail near Fairfax, where the group had fled on bikes. They also shot and killed his dog, who survived.

Carter's stolen car led law enforcement operators to Portland, Oregon, via a GPS locator, where the three were arrested. The gun used in both murders was taken from an unlocked vehicle in the Fisherman's Wharf area.

Previously: Key Plea-Bargain Witness In Meth-y Drifter Murder Case Explains Why They Chose Their Victims