A Warminster man is charged with criminal homocide.  18-year-old Erin Mitchell allegedly shot his roommate during an arguement over a marijuana cigarette.  A shotgun was used to kill 20-year-old Cory Kesselman at the Meadowwood Condominiums on West Street Road.  Investigators say the friendship between the two men had started to sour and the disagreement over the drug was the straw that broke the camel's back.