A 43-year-old Irvine man was “waiting and watching” before he carried out the fatal stabbing of his estranged wife’s boyfriend at his dental practice, a prosecutor told jurors Monday while the defendant’s attorney made the case that his client was not guilty of murder and just “snapped” before he attacked the victim.

Hongli Sun is charged with murder and assault with a deadly weapon and faces sentencing enhancements for the personal use of a deadly weapon and inflicting great bodily injury.

Sun is accused of fatally stabbing 54-year-old dentist Xuan Liu July 18, 2015, in a parking lot at 4980 Barranca Parkway.

“The motive is the affair and, more specifically, it is Mr. Sun’s anger, jealously and ultimately the desire for revenge,” Senior Deputy District Attorney Mark Birney said in his opening statement.

Sun and his then-wife Cynthia Chen had an 8-year-old son at the time and were in the process of getting divorced again, Birney said.

The two divorced in November 2014 because of Chen’s affair with the victim, Liu, who was her boss, Birney said. They got the divorce vacated and were remarried in January 2015 when Chen said she needed treatment for cancer and had “green card issues,” Birney said.

But when Sun grew suspicious that his wife was carrying on her affair with Liu the two were on the road to divorce again, Birney said.

“On the Saturday morning of July 18, 2015, he drove his brand new Mercedes-Benz… to the medical office plaza where Dr. Liu worked and Cynthia Chen previously worked,” Birney told jurors.

“He suspected his wife wasn’t where she said she was going to be… Mr. Sun suspect she was not at her new place of work, but was back with Dr. Liu’s office where she had worked for four years.”

Liu and his wife were also getting divorced because of the affair, Birney said.

When Sun saw that Liu was at lunch the defendant “waited and watched” and when Liu returned to his office, Sun hit the accelerator in his sport-utility vehicle and slammed it into Liu, Birney said.

“He then jumped out of the car and took his knife and he chased down Dr. Liu, who had fled from where he had originally been run down,” Birney said.

Sun “repeatedly” stabbed Liu, who sustained 17 stab wounds, the fatal one to the chest, Birney said.

An employee of Liu’s, who attempted to stop the attack, was stabbed in the left calf, Birney said.

Sun bought the knife on May 18, 2015, Birney said.

“The defendant bought a weapon,” Birney said. “The defendant chose the time of attack and the location of the attack.”

Sun’s attorney, John Barnett, said his client was told that his wife had contracted cancer from a sexually transmitted disease Liu gave Chen.

“She says, `I’m about to die. There is no cure,”’ Barnett said.

Sun took his wife back and attempted to reconcile with her for the sake of their son, who he was caring for while Chen had returned to China, Barnett said.

“Forgiveness repaid by betrayal,” Barnett said. “That forgiveness begat betrayal and further forgiveness begat further betrayal. After being stretched over time… he finally snapped and he killed Dr. Liu.”

Sun was not sure his wife was having an affair with Liu when he drove over to confront the dentist, Barnett said.

“He does not know Dr. Liu’s schedule,” Barnett said. “And Dr. Liu is rarely in town… He’s suspicious so he goes to the medical clinic.”

Sun bought the knife because Liu’s estranged wife, Junli Zha, a physician who worked in the same office as her office, was having an affair with a “gangster,” Barnett alleged.

Zha was using explicit photos of Liu and Chen as “leverage” in her divorce with Liu, Barnett said.

Chen warned Sun that they “were in danger,” so Sun got a knife for protection, Barnett said.

When he saw Liu and Chen together the day of the attack returning from lunch, “He snaps,” Barnett said.

Sun stabbed Liu’s assistant accidentally, Barnett said.

“Then (Sun) sits down and says kill me,” Barnett said.

Sun told police, “I lost my mind in the moment,” according to Barnett.

“He snapped and he’s not guilty of murder,” Barnett said.

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