Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: A former Fortune 500 executive from New Hampshire who caused a highway crash that killed a Vermont couple and their unborn baby was accused of being 'heartless' in court on Wednesday by angry family members. Prosecutors have said Robert Dellinger told investigators he was trying to kill himself in December 2013 when he drove his pickup truck across an Interstate 89 median and smashed into an SUV carrying 24-year-old Amanda Murphy, who was 8 months pregnant, and her fiance, 29-year-old Jason Timmons. Relatives of Murphy and Timmons tore into Dellinger during the first of the two-day sentencing hearing. Amanda Murphy's mother, Tammy Langlois, and Murphy's sister, Ashley Murphy, cry after speaking about the moment they learned of the accident that killed Murphy, her unborn child, and her fiancee, Jason Timmons, during Robert Dellinger's sentencing on WednesdayRobert Dellinger, 54, allegedly tried to kill himself in December 2013 by driving across highway, but instead he killed a young coupleAmanda Murphy, 24, and Jason Timmons, 29, were killed instantly in the crash in Lebanon, New HampshireMurphy was eight months pregnant with their first child, a girlDellinger pleaded guilty in February to negligent homicide for their deaths, and to assault for the death of the fetusHe faces 12 to 24 years in prison when sentencing resumes on Thursday 
 Question:Defense lawyers have said _ was suffering from delirium due to a 'toxic regime' of prescription medications for multiple sclerosis and depression.

Robert Dellinger