A Pinellas County Sheriff’s Office homicide detective who has played a leading role in the case against parking-lot shooter Michael Drejka was arrested and fired after he showed up drunk to a death investigation scene, deputies said. George D. Moffett Jr., 48, was off-duty before he responded about 10:30 p.m. Thursday from his home in Riverview to a fatal shooting at 10610 Gandy Boulevard in St. Petersburg, according to the Sheriff’s Office. After he got out of his unmarked agency car, deputies noticed he smelled like alcohol, had bloodshot eyes and was slurring his speech, the Sheriff’s Office said.