A man shot and killed his pregnant wife and their two children before he killed himself, according to authorities.

Police believe a 39-year-old man shot and killed his pregnant wife and two young children before taking his own life.

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Police say Nicholas D. Arruda, 39, shot and killed his pregnant wife, Danielle, 39, and their two young children. “My brother committed the most cowardly despicable act one could perpetrate,” Arruda’s brother told the Globe.

According to West Greenwich police, Nicholas Arruda, 39, shot and killed Danielle Arruda, 39, Adele Arruda, 5, and Felix Arruda, 2, before turning the gun on himself. Danielle Arruda was seven months pregnant at the time of her death.

Investigators believe Zachary Hatcher, 38, killed his children, Jeffrey Hatcher, 8, and Charlotte Hatcher, 6, before he killed himself, police said.

According to Brighton police, officers were called to a home on Hollyvale Drive just before noon on Friday to assist an unresponsive girl on the porch. The child - 11-year-old Anne Mancuso - was taken to Strong Memorial Hospital, where she died from gunshot wounds.