Bryan Titsworth / WFAA-TV

The suspect fought with police outside a South Dallas dairy plant early Monday morning.

DALLAS — A man died in Dallas police custody early Monday after approaching a warehouse security guard while acting strangely and having hallucinations, police said.

“Probably the most force that was used was just placing the handcuffs on him,” said Sgt. Warren Mitchell, a police spokesman.

Shortly before 2 a.m., the man walked up to a security booth at the Borden dairy in the 5300 block of South Lamar Street. His strange and excited manner prompted the guard call police and try to detain him, police said.

The security officer and police faced some resistance as they tried to get the man into handcuffs, but no extraordinary measures were taken, police said.

“They didn’t use any mace, or any Tasers, or anything like that,” Mitchell said.

As they got the man under control, he went into convulsions, police said. Emergency responders took him to Baylor University Medical Center at Dallas, where he was later pronounced dead.

Detectives were still looking into the incident Monday morning, but police said the preliminary investigation indicated the man died of excited delirium, which is an overdose of adrenaline typically associated with drug use.

The man was not immediately identified.