Jamison McMaster was 27 and living in Durango, Colorado, when he was killed by a gunshot on November 22, 2021, in La Plata County. The death arose from a deteriorating friendship with Nicolo Nico Tonelli, marked by heavy drug use, financial disputes, and prior physical fights. The night before the killing Tonelli allegedly struck McMaster in the head with a rock, leaving a gash McMaster showed in a nine-minute Instagram Live video the morning of his death; in that video McMaster referenced a past traumatic brain injury and appeared confused.

Later the same day Tonelli, then 24, shot the unarmed McMaster in the driveway of their rented house on Dream Catcher Lane. Two other men present fled without notifying authorities. McMaster’s body was later found in the back of a Dodge Durango; investigators concluded the body had been moved and that Tonelli had removed a digital video recorder from the home. Tonelli was charged in connection with the killing; his defense claimed self-defense while the prosecution described a dispute over marijuana and pointed to post-shooting actions as evidence against him.

A jury returned verdicts and a sentence in 2024. McMaster’s family said he was in a mental health crisis and asked why a friend had not called for help after the shooting. If anyone knew McMaster, Tonelli, or was present that day, what information can be shared with investigators?