A Randolph man with a 19-page arrest record is now accused of threatening to stab a woman with a hypodermic needle at a Boston bus stop.

Marquis Alexander, 32, has been charged with: assault with hypodermic needle, possession of heroin (subsequent offense), and possession of a class E drug (subsequent offense) following Monday’s incident near South Station.

A woman at around 1:02 p.m. approached an MBTA police officer who was assigned to a traffic detail at Atlantic Avenue and Essex Street — and told the cop that a person just tried to stab her with a needle. She reportedly pointed to a man, later identified as Alexander.

The woman told police that she was sitting at the Silver Line bus stop on Essex Street when Alexander asked her for the time, but she did not respond.

“Alexander then said to her, ‘I know I am on drugs, but you can still talk to me,’ and raised a hypodermic syringe and said, ‘If I stab you with this needle full of blood,’ ” the Suffolk DA’s office said in a statement.

The woman immediately left the scene, and reported the incident to the officer.

When the cop approached Alexander, the suspect appeared to be hiding an object with his right hand in his sweatshirt pocket. The officer, who believed the object was a hypodermic needle, ordered Alexander to drop the needle — and Alexander complied.

Officers searched Alexander and recovered two other needles, a silver gum wrapper containing a brown substance believed to be heroin, and a clear plastic bag that officers believed to contain crushed narcotic pills.

Alexander was ordered held on $2,500 bail, and to stay away from the bus stop. Also, the judge revoked Alexander’s bail on a pending Roxbury case in which he’s charged with possession with intent to distribute Class A, Class B, and Class C drugs.

He’s scheduled to return to court on June 5 for a probable cause hearing.

Alexander has a 19-page board of probation record dating back to 2003, and has been convicted of numerous violent and drug distribution offenses out of Boston, Brockton, and Quincy. He was convicted in Suffolk Superior in 2019 for unarmed robbery and sentenced to three years in state prison.

“Personal safety and security of place are our goals for all residents and visitors to Boston, whether they’re walking to work, shopping, sitting in a restaurant or waiting at a bus stop,” Suffolk DA Kevin Hayden said in a statement. “We know that repeat offenders can have a pronounced role in degrading neighborhood quality of life, and we will continue our focus on holding them accountable.”