Investigators want to question two half-brothers of the wife of slain former national sports shooter Jakkrit Panichpatikum, a police source says.
The investigators have discovered that Jakkrit had a heated quarrel with his wife, Nitiwadee Pucharoenyos, after she lent some of his money to her relatives without telling him, according to the source.
Jakkrit allegedly berated his wife's family for borrowing the money which started a feud between the sports shooter and Dr Nitiwadee's family.
The investigators also want to look into a deal in which Jakkrit bought a luxury sports car from his wife's relatives.
Police will also examine a life insurance policy Jakkrit took out worth tens of millions of baht.
The source said the investigation team will summon two of Dr Nitiwadee's half-brothers for questioning. The pair were identified only as Mr Tong and Mr Nui.
Earlier, Metropolitan Police Bureau chief Kamronwit Thoopkrachang said the only possible motive for the murder stemmed from a dispute between the former athlete's family members and people close to him. Jakkrit, 40, was shot dead by a motorcycle pillion rider on Oct 19 while he was driving his Porsche Boxster near Ramkhamhaeng Soi 166 in Min Buri district.
Air force commander ACM Prajin Jantong yesterday said four air force officers hired as security guards for Dr Nitiwadee would return to their unit.
The commander said he did not want air force personnel handling a job that could endanger their careers.
The officers were previously granted permission to provide security for Dr Nitiwadee since the job was in their spare time and because uniforms or weapons were not required.
The air force chief said he has asked AVM Poramet Ketkowit, commander of the Office of the Don Muang Royal Thai Air Force Base, to order his officers to steer clear of second jobs that could result in them being drawn into criminal activities. He said he was confident the four officer were not involved in Jakkrit's murder. Dr Nitiwadee's family hired them as bodyguards after the couple argued.