But she has no idea who might have wanted to kill her friend.
"I don't know any more than anybody else," Reese said outside the church auditorium.
As the funeral ended at Tabernacle of Prayer in Jamaica, Reese said: "I just know he's gone now."
Clark was remembered as a young man who loved football, a sport he played at Westbury High School before graduating in 2004, and as someone who tackled life's obstacles.
"He was hardheaded," said Reese, adding that Clark had helped her through personal struggles. "But for the most part, he was a stand-up person."
He was killed Monday night on Jesse Street in Freeport. Both Clark, 22, and Lawrence, 20, whose funeral was Friday in Garden City Park, were shot multiple times. No arrest has been made.
At least a half-dozen New York City police officers filled the lobby of the ornate church, a former theater on Jamaica Avenue. Nassau County police detectives, who are investigating the homicides, were also at the funeral.
Nassau officers were looking for leads, and they said the NYPD were at the funeral because there were so many people there.
Nassau police have published fliers that ask for the public's help with information about the case.
Richard Linton, of Westbury, Clark's stepfather, spoke during the funeral.
He recalled Clark as a "precious" person who protected his family.
"It's a tragedy this happened to him," he said. "He's missed."
Minister Jawan Williams officiated at the funeral, and recalled how Clark had attended services at Tabernacle of Prayer on March 29. Clark had gone to the church as a child but hadn't been to services for a long time. But he returned at the urging of his mother, Cynthia Linton, of Westbury.
"He broke down in tears," Williams said. "His head was in my chest. Eight days later, he'd be in eternity."
Nassau police are asking anyone with a tip about the shooting deaths of Christopher Clark, 22, and Brendan Lawrence, 20, to call CrimeStoppers at 800-244-TIPS. Callers may choose to remain anonymous. Police said they are also offering up to $2,000 for information leading to an arrest.