A police motorcycle officer died after a crash while escorting Hillary Clinton’s motorcade to a campaign rally. “We are just heartsick at this loss of life in the line of duty,” a subdued Clinton told reporters after the rally. The Democratic presidential candidate canceled her next appearance in Fort Worth, telling about 2,000 people who had gathered outside the Tarrant County courthouse that it would be inappropriate to campaign in the wake of the accident. Killed was 20-year Dallas police Sr. Cpl. Victor Lozada-Tirada, who had a wife and four children. “It is important that we respect and appreciate their service,” she said. “I certainly am grateful for all they do for me.” Police Chief David Kunkle said Clinton had called to offer her condolences to Lozada’s widow and fellow officers. Lozada died after apparently crashing into a curb along a viaduct near downtown Dallas, Dallas police said. Aerial video showed wreckage scattered for several yards.