Former Goa Tourism Minister Fransisco Pacheco had met his close friend Nadia Torrado for two days before she allegedly consumed poison on May 15, police said.
The Crime Branch, investigating the death of the 28-year -old woman, said they have found several contradictions in the statements given by Nadia's family during the probe.
The investigators are corroborating statements by Nadia's mother Sonia, her two brothers, a maid servant and the NCP leader, who was grilled for nine hours before he went missing.
According to Crime Branch, the ex-minister had met Nadia on May 13 and 14. It is also probing whether the 46-year-old lawmaker was present at her house when she took rat poison.
Crime Branch has also found that Nadia's mother was not in her house when her daughter took the extreme step, a claim denied by Sonia.
The origin of injuries on Nadia's body is also under probe. The postmortem conducted at Chennai after her death on May 30 revealed 14 injuries on her body.
"The postmortem points out that the injuries were afflicted on the body 14-16 days before her death," public prosecutor Sarojini Sardinha said.
Nadia underwent treatment at various hospitals in Goa, Mumbai and Chennai for 15 days before she died.
Sources said Nadia's family members have claimed that these injuries were caused during the treatment.