What happened to Edward Grim after Thomas Becket died?

After Thomas Becket's assassination in 1170, Edward Grim, who was present during the attack, survived despite being severely injured while trying to protect Becket. He later became a monk and was associated with the Abbey of St. Augustine in Canterbury. Grim is known for his eyewitness account of Becket's murder, which contributed to the historical understanding of the event and Becket's subsequent canonization as a saint. His writings reflect the tumultuous relationship between the church and the monarchy during that period.