Grim Reefer #1 (of 4)

Marty is coerced by his scumbag second cousin Grant to be his wheelman for a "simple robbery." When people start dying, Marty makes his escape. Left on his own, Grant has a stand-off with the cops in that ends with him being killed in a hail of gunfire. In the aftermath, a drug dealer realizes this could be a good place to expand his weed operation, but Grant's spirit is tied to the ground he died on and the weed grown there is infused with his ghost, which wants revenge on Marty & the cops.