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: The widow of a cardiac surgeon shot dead at a Boston hospital by his patient's son has given birth to their fourth child, a baby girl, less than three months after the doctor's slaying. Brigham and Women's Hospital announced Monday that Mikaela Jane Davidson was born April 4. Mikaela's father, Dr. Michael Davidson, was killed at the hospital January 20, leaving behind his wife, Dr. Terri Halperin, daughters Kate, 10, Live, 8, and their 2-year-old son, Graham. Scroll down for video New life: Mikaela Jane Davidson was welcomed into the world April 4, less than three months after her father, Boston heart surgeon Dr Michael Davidson, was shot dead by a deceased patient's sonDr. Michael Davidson was shot dead by Stephen Pasceri at Brigham and Women's Hospital in Boston in JanuaryPasceri's sister said he blamed the doctor for his mother's recent deathMarried Pasceri took his own life after shooting Davidson at heart centerDavidson's wife, plastic surgeon Dr Terri Halperin, was seven months pregnant at the time with their fourth childHalperin delivered daughter Mikaela Jane Davidson April 4, less than three months after husband's slaying 
 Question:Pasceri's relatives suggested that he was angry over the death of his mother, whom Dr _ had treated.

Michael Davidson