A 20-year-old youth allegedly killed his sister's father-in-law for harassing her in Murbad taluka of the district, police said on Thursday.

The accused, Dashrath Thackeray, along with two other family members, on Wednesday went to the house of his sister's in-laws in Badanewadi hamlet of the taluka and tried to inquire why they were harassing her, Assistant Superintendent of Police Bachchan Singh said.