A man charged in connection with the drive-by killings of a Massachusetts mother and her infant son in Connecticut opened fire over a $400 debt, according to a newly released arrest warrant.

A man accused of shooting and killing a mother and her 4-month-old child in Hartford in November allegedly opened fire over a $400 debt and did so moments after acknowledging that the baby was in the vehicle, according to the warrant affidavit supporting his arrest.

Lance Morales, the man accused of killing a 4-month-old baby and his mother in Hartford before running off to Puerto Rico, faced a Connecticut judge Monday.

A Springfield mother owed a man $400 for renting a car from him. When she fell behind on payments, he tracked her down in Hartford and opened fire, police say.

Lance Morales was brought back to Connecticut on Saturday to face a judge after allegedly killing a mom and her baby, and escaping to Puerto Rico. “He even attempted to elude capture for several days.

Lance Morales, 23, charged in the drive-by killings of Jessiah Mercado and her 4-month-old son in Hartford, was held Monday on $5 million court-set bail.