An 8-year-old boy attacked with a hammer by his mother’s ex-boyfriend died in a hospital Wednesday, according to Sacramento police.

The attack happened Sept. 1 around 6:25 a.m. inside a home along Melinda Way.

The ex-boyfriend, later identified as Deandre Chaney Jr., 23, was later arrested in Nevada after reportedly escaping from a train station and jumping a fence near the Winnemucca Indian Colony.

Chaney is accused of attacking his ex-girlfriend and two children – a 7-year-old girl and the 8-year-old boy – with a hammer.

The woman and the 7-year-old remain in the hospital in critical condition, police said.

Police believe Chaney’s charges will be upgraded once he is extradited from his cell in Nevada.