RIO DE JANEIRO (AP) — A Brazilian politician is denying allegations he was involved in plotting the death of a fellow Rio de Janeiro city council member who was a prominent social activist.

Councilman Marcello Siciliano told reporters on Wednesday that he had a good relationship with Marielle Franco, who was killed on March 14.

The O Globo newspaper reported on Tuesday that a witness told police he overheard Siciliano and a former police officer begin plotting Franco's murder in June. The witness said the former officer belonged to a police-linked militia.

Brazil's Public Security Minister Raul Jungmann has said that militias may have been responsible for killing Franco. Militias include current and former police officers who vie with criminal gangs for control of Rio's poor communities. They've been accused of summary executions.