Zokhumi, who retired as headmistress of a girls school, might be a victim of a burglary in her house last night, police officials said.
Superintendent of Police P C Laldina said details would be available after post-mortem of the body.
Lalsangzuala was a veteran Congress leader and had been a minister for three terms.
At present, her son-in-law Zodintluanga is a senior minister in the state government.