A nurse who previously worked at a home for the elderly in central Japan was arrested Sunday for an alleged 2017 assault on a resident in her 90s, with police suspecting he was also involved in four other cases.

Takeshi Odori, 33, is suspected to have severely injured Hideko Yokoyama, then 91, around 2 p.m. at the Soleil nursing home in Takayama, Gifu Prefecture, on Aug. 15, 2017.

The alleged attack caused her to require two months of treatment and the resident, who was mostly bedridden, died on Oct. 3. The autopsy performed on her body found no evidence of foul play in her death.