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COMING UP ON "DATELINE"

FRIDAY, JULY 30

When a mother-to-be is found dead, detectives search the cell phone records of her womanizing fiancé in hopes of identifying the killer. Hoda Kotb reports.

SUNDAY, AUGUST 1

Kate Snow reports on struggling minority fishermen in the Gulf, and whether BP is keeping their promise to support those left without work.

An arms dealer who allegedly supplied weapons to terrorists and drug traffickers is snared in a DEA sting operation. Chris Hansen reports.

Chris Hansen goes on patrol with the "Eco-Cops," a special brand of law enforcement in charge of keeping the air, streets and water clean in the urban jungle.

MONDAY, AUGUST 2

After years of trying to make their relationship better, the marriage of a successful Nashville couple ends when the husband is found dead in a closet. Keith Morrison reports.