A 33-year-old man pleaded guilty Wednesday to a federal bank robbery charge, admitting he robbed a Central Business District bank in a khaki boonie hat, safety vest and sunglasses, then ran off in a trail of red ink dye after a security pack exploded.

U.S. District Judge Jay Zainey set a Dec. 15 sentencing date for Larry Williams, who pleaded guilty to a single bank robbery count from a February 2014 indictment. Williams faces a maximum of 20 years in prison.

Williams admitted he approached a teller at the J.P. Morgan Chase Bank in the 200 block of St. Charles Avenue with a note that read, “I have a gun don’t move give me all the (expletive) money.”

The teller “dropped the note and activated a silent alarm while opening a money drawer. She removed a bundle of currency — containing a dye pack — from the drawer and placed it on the counter,” according to the “factual basis” underpinning Williams’ guilty plea.

Williams then put the cash in a white plastic grocery bag and walked out with $6,531. The dye pack exploded as he ran down Gravier Street, and he discarded the bag of cash. He walked into a loading dock at Place St. Charles, discarding attire that included the boonie hat, a fluorescent yellow safety vest, a bandana and tennis shoes.

DNA tests on the clothing turned up a match for Williams, who has a prior conviction.