06/27/2011 01:41 pm ET Updated Aug 27, 2011

Lisa Norton Kills Gabriel Nielsen In Hit-And-Run, Attempts To Swim Away (UPDATE)

32-year-old Lisa Norton was sentenced last Thursday to twelve months of probation in Boulder county for driving while ability impaired.

Yesterday prosecutors filed first-degree murder against Lisa Norton for the fatal car crash that killed 33-year-old Gabriel Nielson, wounded his sister and critically wounded his young daughter Avery who is suffering brain injury as a result.

Norton is under suicide watch in Boulder County Jail, where she is being held on a $1 million bond.

According to the court filing, Norton has displayed "an attitude of universal malice manifesting extreme indifference to the value of human life."

Norton is due to appear in court for a preliminary hearing September 8.

Colorado State Patrol reports that, the following Saturday, a woman also named Lisa Norton was involved in two accidents near Longmont, both believed to be alcohol-related. Authorities have yet to verify that Lisa Norton is the same woman in both cases.

While Norton's first accident Saturday was a side-swipe hit-and-run that caused no injuries, in the second, her Ford Ranger pickup crossed Nelson Road and hit an oncoming Nissan coupe.

Westword reports that Gabriel Nielsen, the driver of the Nissan, was killed. Passengers Cherish Francis, 24, and a 2-year-old child were seriously injured.

Police say that Norton fled the scene on foot and attempted to swim away from authorities in a nearby lake. Boaters picked her up and turned her over to the Longmont Police.