Teens’ night of rock throwing leads to murder conviction for 1 of them

Three Denver-area teens cheered each other during a night of throwing rocks at cars — until one of the stones crashed through a windshield and killed a woman, leading to a murder conviction Friday after the trio turned on one another.

Jurors found Joseph Koenig guilty of first-degree murder in the death of Alexa Bartell on April 19, 2023, after the other young men riding with him reached deals with prosecutors and testified against him. Koenig, now 20, was also convicted of attempted murder and other less serious crimes for rocks and other objects thrown at vehicles the night Bartell was killed and in previous weeks.

Bartell’s family and friends hugged and cried in court after the verdict...