The June killing of a 65-year-old Whitmore Village man that led to charges against four people was preceded by the man’s breakup with his 26-year-old girlfriend, who has become a key suspect in the slaying, Honolulu District Court documents say.

The victim, William Aki, was found lying in a pool of blood on his living room floor on the night of June 23. He was pronounced dead shortly afterward, and an autopsy determined he died of gunshot wounds to his head and torso.

Police arrested four people last week in connection with the slaying: Anjelita Rasa, 26; Shaun Branco- Taguchi, 29; Shane Rodrigues, 30; and Jessica Samson, 26. All four are being held at Oahu Community Correctional Center.

Rasa and Branco-Taguchi were charged with second-degree murder. Bail for both was set at $1 million. Rodrigues was charged with being an accomplice to murder, and his bail was set at $500,000. Samson was charged with second-degree arson. She was being held in lieu of $25,000 bail.

Branco-Taguchi, Rodrigues and Samson have preliminary hearings scheduled for Wednesday in District Court, while Rasa is scheduled to make an initial appearance Wednesday in District Court.

On June 23 police found Aki after officers responded to a report of a car burning near Makua Cave and traced the burning BMW’s license plate to Aki. Police went to Aki’s home, where he was found.

According to court documents, Aki’s daughter told police Rasa was her father’s former live-in girlfriend who used Aki for money to buy drugs, a place to live and his car. She said Aki kicked Rasa out a week before he died because he learned Rasa was “fooling around on him.”

Police spoke to another man who said he allowed Rasa to live with him after Aki had “thrown out (Rasa’s) belongings.”

On Aug. 5 police arranged a meeting with Rasa, who confessed her involvement in Aki’s killing, court documents say.

Through the investigation, police determined Rasa’s boyfriend, Branco-Taguchi, shot Aki with a firearm and later set fire to Aki’s BMW. His cousin, Rodrigues, provided him with the firearm, documents say.

Rodrigues’ girlfriend, Samson, told police on three separate occasions that she had no knowledge of the incident and was not present when Aki’s vehicle was set on fire, a police affidavit says.

Police later discovered Samson was present when Aki’s car was set on fire and that she had provided the ignition source.