Casslyn Welch, the alleged accomplice of three Arizona prison inmates who escaped custody last year and went on a murderous rampage through several states, pleaded not guilty to federal murder charges in New Mexico this morning.
Last week, Welch, the fiancee/cousin of one of the escaped inmates, pleaded guilty to state-level charges of escape and robbery, for which she'll be sentenced to 20 years in prison.
Welch's 20-year sentence won't be served until federal car-jacking and murder charges against her are resolved in New Mexico for the murders of Linda and Gary Haas -- both 61 and from Tecumseh, Oklahoma.
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The victims, who were about to become grandparents, were on their annual summer trip to Colorado when their paths crossed with Welch the escaped inmates.
Authorities believe the couple met the thugs at a rest area along Interstate 40 in eastern New Mexico.
It's believed the couple were shot in their travel trailer before the inmates and Welch drove it to a remote area, unhitched the Hass' truck, and torched the trailer with the bodies of the inside.
In exchange for the guilty plea, prosecutors agreed to drop several other charges against Welch stemming from the escape, including kidnapping and aggravated assault for the abduction of two truck drivers -- who both were released unharmed -- the night of the escape.