A Massachusetts woman's murder trial is ongoing, with her ex-husband testifying about a tragic event. He has taken the stand to discuss the day she was involved in the deaths of their three children. The ex-husband's testimony is a key part of the trial, but details of what he has said are not specified.

For more information on the case and his testimony, readers can refer to the original source. Further details on the trial and the ex-husband's testimony are available from ABC7 News, the source of this information.