Norwell woman allegedly recorded grand jury testimony in Marshfield murder case

A 36-year-old woman has been indicted for allegedly recording grand jury testimony in connection with a brutal murder case. 

Brianne St. Peter McMahon, of Norwell, is facing three counts of wiretapping, one count of misleading a police investigating and distribution of transcript or distribution of grand jury testimony with intent to interfere with criminal proceedings.

McMahon and her friend are witnesses in the brutal murder of 45-year-old Robert McKenna, according to the Plymouth County District Attorney’s Office. 

McKenna was found dead in his Marshfield home on Sept. 16, 2015. Four people have been charged in McKenna’s death. 

State Police allege McMahon secretly put the phone into her friend’s pocket and recorded the friend’s grand jury testimony, according to the DA’s office. 

According to the DA’s office, in October 2015, State Police learned somebody had sneaked a phone into the grand jury room in a witnesses’s pocket and recorded the jury proceedings.

State Police seized the phone from the witness, according to the DA’s office. 

McMahon later went to the DA’s office in Brockton to retrieve the phone. However, State Police interviewed her and arrested her. 

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