ASPEN — A 32-year-old Aspen man who reportedly pushed a snowboarder off a chairlift at Aspen Highlands in January will plead not guilty by reason of insanity to charges related to the incident, his lawyer said Monday.

Attorney Pamela Mackey of Denver said she wanted to travel to Tennessee, where Thomas Proesel is undergoing mental-health treatment, and arrange a Skype or phone hearing with the District Court during which he would enter the pleas to felony attempted assault and misdemeanor reckless endangerment.

On Jan. 17, Proesel pushed a 28-year-old local photographer and snowboarder off the Loge Peak chairlift near the top of the lift, after the man made an innocuous comment about skiing versus snowboarding, reports say.

The photographer fell 20 to 25 feet, landed in a pile of fluffy snow and was not injured.

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