NYC subway murder suspect used to behave erratically after smoking 'K2' drug

[Collection]Sebastian Zapeta-Calil, a Guatemalan migrant with a history of erratic behavior due to substance abuse, has been charged with first-degree murder and arson for setting a woman on fire while she slept on a Brooklyn subway train. His roommates describe him as a heavy K2 and alcohol user, with altered but non-violent behavior when sober.