All three suicides took place in April
TokyoReporter
Police are investigating the circumstances that led to the incident
Suspect was found with a container of kerosene inside his vehicle, police said
Suspect denies the allegations in both cases, police said
Man's head had been severely beaten, police said
Police are questioning the man on suspicion of abandoning a corpse
Police seized about 700 sleeping pills from the suspect's residence
Police took the driver of the vehicle in for voluntary questioning
Momona Yoshioka had suffered dozens of stab wounds over her body, police said
Man is believed to have been dead for up to one decade, police said