Mark Hasse, slain Texas prosecutor, is celebrated in memorial service

Mark Hasse - Texas Assistant District Attorney
Mark Hasse, a Texas prosecutor, was fatally shot Jan. 31, 2013 in a parking lot about a block from the Kaufman County courthouse.

(AP) TERRELL, Texas - Mark Hasse, a Texas prosecutor gunned down outside his courthouse office last month, was remembered Saturday for his zealousness in pursuing tough cases, love of flying and ability to tell stories.

Hundreds turned out in a school auditorium to celebrate the life of Kaufman County Assistant District Attorney Mark Hasse during a 90-minute memorial service that included stories about the veteran prosecutor's tough and softer sides as well as vows to catch his killer.

Hasse, 57, was shot multiple times the morning of Jan. 31 while walking from his car in a parking lot about a block from the courthouse. The brazen crime has sparked an investigation that includes both local and federal authorities, many of whom attended the Saturday ceremony.

Kaufman County District Attorney Mike McLelland described how Hasse, who wasn't married and had no children, never backed away from anything while often telling stories that brought laughter heard throughout the courthouse.

McLelland then turned to the effort to find Hasse's killer.

"He knows and I know there will be a reckoning," the DA said. "Too many people are focusing on that. That's not going to be a problem."

The slain prosecutor's brother, Paul Hasse, also mentioned the search for the gunman.

"You honor him by the massive effort you are making to find out who did this," he said.

Several speakers traced Hasse's career from his time as an assistant district attorney in Dallas in the 1980s to his decision three years ago to join the DA's office in Kaufman, about 30 miles southeast of Dallas.

Dallas attorney Marcus Busch, who worked with Hasse in the Dallas DA's office, called Hasse "the consummate prosecutor," describing how he rose from handling cases in misdemeanor courts to being the chief of the unit charged with prosecuting organized crime.

Hasse left private practice to work as a prosecutor in Kaufman because "that's what his passion was," Busch said.

"I'd rather be in court trying a case with Mark than being in this room today," he said, stopping to gain his composure.

Justin Lewis, an officer with the sheriff's department in Kaufman County who previously served as an investigator in the county DA's office, also spoke of how Hasse "enjoyed putting criminals in jail." Fighting to control his emotions, Lewis ended his remarks by saying the killer will be caught.

"Answers will eventually come," he said. "We must remain vigilant."

Complete coverage of Mark Hasse on Crimesider