Sgt. Eric Janik, 37, was charged with assault and reckless endangerment for pointing his service handgun at the worker, who was dressed as Leatherface, the killer from "The Texas Chainsaw Massacre," Baltimore County police said.
The employee, Mike Morrison, followed Janik and several other people up a staircase Sunday night at the end of the haunted house tour in a bid to get "one last scream" out of them, police said.
When the group exited into a parking lot, Janik pulled his gun and pointed it at Morrison from less than 10 feet away, according to police and Morrison, who said he dropped the chain saw, put his hands up and backed away. The saw had no chain.
Only then did Janik identify himself as a police officer, said Morrison, who retreated into the building.