Testimony at a first-degree murder trial suggested a massive mix-up over text messages between acquaintances is what led to a 34-year-old mother of four being fatally shot instead of the intended victim of a gang hit.

Randy O'Hagan is accused of shooting and killing Lorry Santos, a 34-year-old mother of four who was inside her home at 203 Peterson Terrace in Saskatoon's Westview neighbourhood on Sept. 12, 2012.

Melissa Star testified Monday that she passed along what she thought was the address of her ex-boyfriend to another one of his ex-girlfriends, but gave the wrong address.

That ex-girlfriend, Serana Lodoen, said she then texted the address to a man she identified as her drug dealer in Lloydminster, Alta., who the trial has heard was O'Hagan.

However, Lodoen testified that he then mistook it for the address of a former member of Alberta's White Boy Posse street gang who witnesses say had a bounty on his head.

Meanwhile, neighbour Marjorie Kowalchuk testified seeing a grey Acura with tinted windows and an Alberta licence plate driving near her home two days before Santos was shot through the window of her family's home.

Last week, witnesses testified that O'Hagan left in a car with that exact description the night before Santos was shot, and returned to a home where he was staying in the same car the next morning.

The ex-girlfriend of an Alberta drug boss testified she had lent him the vehicle.