NSW MLC Jeremy Buckingham has secured parliamentary support for an inquiry into unsolved murders and long-term missing persons cases in the state.

The inquiry, formally backed by parliament yesterday, will examine how investigations have been conducted and identify ways to improve them.

"For a long time, there has been a call from the people of NSW for an inquiry into how murdered and missing person investigations are conducted," Mr Buckingham said.

It will focus on high-profile unsolved cases, including Christine Sharrock, Marianne Schmidt, Cheryl Grimmer, Kay Docherty, Toni Cavanagh, Michelle Pope, Stephen Lapthorne, Leanne Goodall, Amanda Robinson, Robyn Hickie, Joy Hodgins, Anni Tominac, Gillian Jamieson, Deborah Balken, Peter Letcher, Carmen Verheyden, Dianne Pennacchio and Gordana

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