A 43-year-old man suspected of orchestrating the murders of a Swiss-based Japanese couple is being held in a hospital after attempting suicide Tuesday on Okinawa's Miyako Island, where he had fled, police said Wednesday.

Police allege the suspect, a corporate executive, played a key role in the high-profile case by luring Makoto Shimomi, a 51-year-old financier, and his wife, Mie, from their condo in the Ginza district of Tokyo on Dec. 7, they said.

The suspect, who has not been identified and was initially wanted on the specific charge of abandoning two bodies, also prepared a vehicle believed to have been used to abduct the couple, the sources alleged.