SUMMERVILLE -- A Dorchester County sheriff's deputy has resigned while being investigated for allegedly driving a patrol car to a bar where he drank while off-duty, authorities said Tuesday.

Deputy Jason Shrewsbury, 23, resigned Friday, and no further action is expected in the case, Maj. John Garrison said.

Shrewsbury had been on administrative leave with pay since sheriff's officials received a complaint on May 24 about his conduct, Garrison said.

"I understand the severity of my actions and apologize to the department and all department staff for the trouble I have caused," Shrewsbury wrote in his letter of resignation.

"I appreciate all the things that this department has done for me over the years and I severely regret my actions."

Shrewsbury was reportedly drinking at The Ice House on East Doty Avenue during the weekend before May 24, and he was seen driving his patrol car to and from the establishment, authorities said.

He was not on duty or in uniform at the time, but driving a patrol car to a bar is a violation of department policy, Garrison said. Shrewsbury's gun, badge and other equipment were confiscated when the department's internal-affairs division began investigating the allegations, Garrison said.

Investigators also determined that allegations that Shrewsbury provided alcohol to a minor at the bar were inaccurate, Garrison said.A 20-year-old woman apparently snuck some drinks at the bar and was asked to leave, but Shrewsbury didn't provide her with alcohol, he said.

Shrewsbury began work at the Sheriff's Office in February 2007 as a dispatcher, and later transferred to the county jail.

He applied to be a patrol deputy earlier this year. Shrewsbury had graduated from the S.C. Criminal Justice Academy less than a week before the alleged incident and had yet to begin field training, Garrison said.

Sheriff L.C. Knight called the incident unfortunate. While he hates to see anyone lose their job, Knight said, violations such as this cannot and will not be tolerated.