A 20-year veteran of the Dallas police force was killed Friday while escorting Hillary Clinton's motorcade.

Dallas police identified the officer as senior Cpl. Victor Lozada-Tirado and said he lost control of his motorcycle when he struck a curb shortly after 9 a.m. He was married with four children.

The officer had been accompanying the Democratic presidential candidate to a campaign rally when the accident happened on the Houston Street viaduct. He was taken to Methodist Central Hospital where he was pronounced dead.

Clinton later canceled the rally in Fort Worth, saying it would not be appropriate to hold the event.

"We are just heartsick over this loss of life in the line of duty, and I have asked that my condolences be conveyed to the family," Clinton told reporters soon after learning of the death. "This reminds us once again what our men and women in law enforcement do every single day. And it's important that we respect and appreciate their service."

Dallas Police Chief David Kunkle said Friday afternoon that Clinton visited the family of the officer at the hospital to personally extend her sympathies.

After the accident, the officer could be seen lying face down in what appeared to be a large pool of blood, while another officer rubbed his back. The motorcycle was badly damaged, and the officer's helmet and debris were strew across the street, near a long set of skid marks.

Click here to read more about the crash at MyFOXDFW.com.

FOX News' Aaron Bruns and The Associated Press contributed to this report.