The final witness to testify on the fourth day of Brian Walshe ’s murder trial on Thursday was a Massachusetts State Police trooper who examined several devices turned over by Walshe for texts, phone calls and location data.

Trooper Connor Keefe was on the stand for roughly two-and-a-half hours on Thursday, painstakingly moving through mobile phone data under questioning from prosecutor Greg Connor.

Keefe first became involved in the investigation into the disappearance of Walshe’s wife, Ana, on Jan. 5, 2023, a day after Brian Walshe reported her missing. He was asked to analyze cellphone records from Verizon associated with Ana Walshe.

Based on records turned over by the network, Keefe determined that Walshe’s phone was near her home at 516 Chief Justice Cushing Highway in Cohasset a

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