NILES, Mich. (WWJ/AP) – A 44-year-old man faces a hearing on charges that he stabbed three fellow Amtrak train passengers and a conductor in southwestern Michigan.

Michael Williams of Saginaw is to appear Monday in court on attempted murder charges.

READ MORE: Michigan Voters Urged To Hand-Deliver Absentee Ballots

Police used a Taser to subdue Williams Friday night as the train was stopped at a depot in Niles, about 10 miles north of South Bend, Indiana. He’s being held in the Berrien County Jail on a $1 million bond.

The four victims were in stable condition Sunday. Niles Police Chief Jim Millin has said Williams didn’t have a relationship with any of the victims.

Millin said detectives spoke with Williams over the weekend, but the chief declined to discuss a motive behind the attack.

READ MORE: Detroit Animal Care To Hold ‘Howl-O-Ween’ Adoption Event October 28-31

Williams’ 89-year-old grandmother says he needs psychological help.

Ethel Williams told WWJ during a phone interview that her grandson Michael Williams was in the military for about 10 years and he was always scared when he got out.  She says he should have gone to the VA (Veterans Administration) when he got out.

She says the 44-year-old Saginaw man once told her “it seemed like everywhere he goes people was following him,” according to the Associated Press.

The train was headed to Port Huron from Chicago.

MORE NEWS: FEMA Extends Deadline To Apply For Assistance Due To Damage During June 25-26 Floods

TM and © Copyright 2014 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2014 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.