Martha Hageon, 48, died on Tuesday after being taken off life support
She had been fatally stabbed by her 26-year-old son Alejandro Sanabria in a Lucky s convenience store in Lufkin, Texas, on Friday night
Sanabria has bipolar disorder and was in day three of a manic episode
Hageon had been attempted to keep him away from his pregnant partner and child until it was over
Sanabria s behavior worsened and Hageon texted her husband to call 911
Officers tracked the pair down to the store but as they approached, Sanabria pulled out a large knife and injured his mother
Officer Gerardo Salinas, 29, also suffered a punctured lung during the arrest