61-year old man disguises as a delivery man to shoot his former female neighbor dead over decades-long feud

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Mad oh! A man who shot dead his former neighbor when she answered the door at her Massachusetts home had disguised himself as a UPS driver, prosecutors have said.

Robert Bonang, 61, is charged with killing 59-year-old Laurie Melchionda after the nurse was found at her Braintree home Wednesday morning suffering from multiple gunshot wounds.

Authorities say Bonang hid his gun inside a box, cut a hole it, before shooting his alleged victim three times in the head and four times in the back. He is said to have 'frantically' rang Melchionda's doorbell in the seconds before the shooting.

Norfolk Assistant District Attorney Greg Connor said a teenager who was babysitting children nearby saw Bonang walk up to Melchionda's door, wearing a surgical mask and brown jacket and carrying a box.

Connor said the teen was walking away with the children when she heard screaming and turned around to see Bonang shooting mother-of-three Melchionda with the gun from the box.

The box is said to have had a UPS envelope taped to it. A gray wig was also found at the scene and Bonang's booking photo shows him in a UPS style brown shirt.

Authorities have not yet said what exactly led to the shooting but the pair had a 'history of issues', according to CBS.

Bonang, who used to live across the street from Melchionda, told the judge he planned to hire private counsel, the district attorney's office said.

Bonang, who is understood to have previously been detained over his mental health, was found by police near the front entrance of her home. He was said to have waved to officers as they arrived.

He had not lived in the neighborhood for six years after his parents, who owned the home, died but he is said to have falsely accused neighbors of 'watching and following him' in the past, Boston.com reports.