Boston police said Thursday that Louis D. Coleman III was arrested on southbound I-95 near Churchman's Road in Delaware.
The department said it was awaiting "positive identification" of the dead body that was also recovered.
But WCVB-TV reports Jassy Correia's brother in Boston has confirmed her body was found in the trunk of Coleman's car after a chase in Delaware.
Coleman had been sought in the disappearance of Correia, who went missing after leaving the Venu nightclub in downtown Boston Sunday night.