People.com Politics Off-Duty Capitol Police Officer Who 'Responded to the Rioting' Dies at 51 Howard Liebengood was with the United States Capitol Police since 2005 and was assigned to protect the Senate By Eric Todisco Published on January 10, 2021 03:30 PM Share Tweet Pin Email Howard Liebengood, an off-duty United States Capitol Police officer and 15-year veteran who responded to Wednesday's violent riots, has died. He was 51. The United States Capitol Police (USCP) confirmed Liebengood's death in a statement on Sunday morning. A cause of death was not immediately disclosed. "The United States Capitol Police is deeply saddened by the off-duty death on January 9, 2021, of Officer Howard Liebengood, age 51. He was assigned to the Senate Division, and has been with the Department since April 2005. Our thoughts and prayers go out to his family, friends, and colleagues. We ask that his family, and other USCP officers' and their families' privacy be respected during this profoundly difficult time," the statement said. According to the USCP union, Liebengood, who joined the law enforcement agency in 2005 and was assigned to the Senate Division, "was among the officers who responded to the rioting at the U.S. Capitol on January 6th." "We extend our deepest sympathies to Officer Liebengood's family and we mourn the death of a friend and colleague who worked alongside us to protect the lives of the Members of Congress, their staff and all who serve at the U.S. Capitol," the union's statement read. "We pay tribute to his service and we grieve for the loss of a fellow officer," the statement added. The USCP has not responded to PEOPLE's request for additional information. Howard Liebengood. Tom Williams/Roll Call/Getty Images RELATED: Colleague of Police Officer Killed in Riots Is 'Sick' Over His Death: 'This Was His Mission' Liebengood is the second officer to die after the Capitol riot, in which a large group of pro-Trump supporters stormed the Capitol building as lawmakers gathered to certify Electoral College votes for President-elect Joe Biden. Officer Brian D. Sicknick, 42, died at 9:30 p.m. Thursday from injuries he sustained "while physically engaging with protesters" during the rampage, the USCP said in a previous statement. "He was a great guy to work with," a colleague of Sicknick, who did not wish to be identified, told PEOPLE. "You knew you could count on him to do his job and be right there when you needed him. He believed in this country and he believed in all of us [who worked with him]." Officer Brian D. Sicknick. USCP Photographer Who Captured Rioters at Nancy Pelosi's Desk Says Mob Was 'in Control of the Building' Four others also died during the riots: Ashli Babbitt, 35, was fatally shot by an officer who was confronting rioters as they stormed into the building, according to police, while Rosanne Boyland, 34, Kevin Greeson, 55, and Benjamin Phillips, 50, all died from "medical emergencies." According to the Capitol Police, over 50 officers from the department and Metropolitan Police Department sustained injuries, while several requiring hospitalization. "The violent attack on the U.S. Capitol was unlike any I have ever experienced in my 30 years in law enforcement here in Washington, D.C.," Capitol Police Chief Steven Sund, who resigned from his post on Thursday, said in a previous statement. "Make no mistake – these mass riots were not First Amendment activities; they were criminal riotous behavior."