UpdatedFri, May 7, 2021 at 9:12 am ET Reply Mark Frederick Zraket of East Boston, Massachusetts, died while in custody at the Rockingham County Jail on April 30. The sheriff's department is investigating his death. (Shutterstock) BRENTWOOD, NH — The Rockingham County Sheriff's Office announced on Friday that it was investigating the death of a Massachusetts man in custody at the county jail on April 30. Mark Frederick Zraket, 54, of East Boston, Massachusetts, was arrested around 11 p.m. on April 29 on a fugitive from just warrant out of Massachusetts as well as felony car theft and posses...