Patasi Devi was killed in Degana village late last night allegedly by her son Bajrang Lal over property related dispute, police said.
Lal, aged around 50 years, is a BSNL employee.
Last night, he poured kerosene over his mother and set her on fire, police said today.
A relative of Devi has lodged complaint against Lal, police said, adding that the matter was being probed.
