BOULDER, Colo. (CBS4) – A teenage hitchhiker suspected in the violent attack on a 71-year-old Boulder County woman is making multiple appearances in court this week.

Investigators say Jeffrey Collins, 16, of Arvada, hit Katie Kulpa at her home near the town of Ward in the Boulder County foothills.

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Jeffrey Collins (credit: CBS)

Jeffrey Collins (credit: CBS)

The attack happened on Sept. 19 after Kulpa offered a lift to Collins and two of his friends. The trio was stranded in Lefthand Canyon.

Katie Kulpa with her son Curtis (credit: CBS)

Katie Kulpa with her son Kurtis Leverentz (credit: CBS)

Authorities say Collins wanted to steal Kulpa’s car and then suddenly attacked her while the group was at her cabin.

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Collins appeared in Boulder County Court on Monday and will be back in court on Tuesday.

Jeffrey Collins (credit: CBS)

Jeffrey Collins (credit: CBS)

The Boulder County District Attorney plans to charge Collins as an adult. He will likely face an attempted murder charge.

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A GoFundMe page has been set up to help victim Katie Kulpa.