ST. LOUIS COUNTY — Prosecutors filed new charges against an 18-year-old who police say was involved in the shooting death of a teenager last year.

Police say that Jadin Smith last year helped 18-year-old Martin Tullis kill 16-year-old Logan Snyder.

The two teens shoved Logan to the ground near the 700 block of Horn Avenue and shot him, according to charging documents filed Friday. They rifled through his pockets then walked off.

Police found Logan lying dead in an alleyway later that day.

Logan was a junior at Hancock Place High School. A message posted by the Michel Funeral Home described Logan as “a kind soul who loved his family so intensely. He could light up an entire room with his beautiful smile.”

Authorities said Smith and Tullis traveled to meet Logan that day, but they didn’

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