The Mother of a Tipperary man shot dead in Bolivia says new developments in the case have brought her light at the end of the tunnel.

Michael Dwyer died in a hotel in April 2009, and authorities there claim he was killed, along with two other men in a shootout after earlier fleeing arrest.

They have alleged he was part of an assassination plot against the country's President, something his family denies.

Now the former public prosecutor in the case has cast doubt over the State's claims.

Marcelo Soza is seeking asylum in Brazil, and is willing to testify to officials in Europe about his investigations.

Michael Dwyer's mother Caroline has met with him - she told Newstalk's Pat Kenny Show (being presented this week by David McWilliams) it has given her some hope of getting justice:

The family has previously called for a UN inquiry into Michael's death.