Police obtained an arrest warrant Friday for actor-singer Manabu Oshio, who has been convicted of using the synthetic drug MDMA, on suspicion that he gave the drug to a woman who died at a Tokyo apartment in August while in his company.

Oshio, 31, was sentenced at the Tokyo District Court in November to 1 1/2 years in prison, suspended for five years, for using the drug.

During the trial, Oshio said the woman, Kaori Tanaka, 30, gave him the drug. But police suspect Oshio obtained drugs from someone other than Tanaka and gave them to her at the apartment on Aug. 2.

Police are also investigating the possibility of charging Oshio with negligence over Tanaka's death.

According to police investigations, Oshio was aware something was wrong with Tanaka around 6 p.m. on Aug. 2 and her condition took a sudden turn for the worse at 6:30 p.m.

Oshio called his manager, saying she had not regained consciousness, and the manager arrived at the apartment about 40 minutes later and called an ambulance at 9:20 p.m.