Not many I can think of, however..

Aileen Conway -- reclassified as undetermined.

Don Henry and Kevin Ives -- reclassified as homicide.

Jeffrey Digman - reclassified as undetermined.

Mario Amado - I think an arrest was actually made, but the guy got off on lack of evidence(?) Sketchy on details here.

Ted Loseff - I thought it was changed to undetermined or maybe even homicide, but can't recall for sure.

Not many I can think of, however..

Aileen Conway -- reclassified as undetermined.

Don Henry and Kevin Ives -- reclassified as homicide.

Jeffrey Digman - reclassified as undetermined.

Mario Amado - I think an arrest was actually made, but the guy got off on lack of evidence(?) Sketchy on details here.

Ted Loseff - I thought it was changed to undetermined or maybe even homicide, but can't recall for sure.

Ted Binion- classified as suicide, then undetermined, then homicide and Sandy Murphy and Rick Tabish were arrested and convicted of his murder.

Joyce Chiang- classified as suicide, then recently homicide after two suspects were identified.

Nancy Manni- I don't remember what the classified her death, probably undetermined, and it was later changed to homicide after John David O'Mara was arrested for her murder.

Michelle Witherell- I think they classified as an accident and then changed it to homicide. Later her husband Jeremy was arrested for her murder, but was acquitted.

Leroy Drieth- classified as "auto-suicide" but autopsy decades later showed he was stabbed and for some reason its only classified as "undetermined"...

Rae ann Mossor- classified as suicide, later changed to undetermined.

Steve Sandlin- classified as suicide, later changed to homicide, but still unsolved.

Didn't the geniuses with the Phoenix P.D. initially classify Doug Johnston's death as a suicide, only to rule it out on the brilliant deduction that there was no gun found at the scene? :rolleyes:

Michelle Witherell's death is now classified as "suicide/accident", after they acquitted Jeremy. Doesn't make any sense.

They also originally said that Kevin Ives and Don Henry died accidentally, but then changed their manner of death to "probable homicide" and then to "definite homicide" when they learned Don had been stabbed before being placed on the railroad track with Kevin.

I know Chad Langford's death was initially ruled to be a suicide, but the Army has since reopened the investigation citing new developments in the case.

Mario Amado - I think an arrest was actually made, but the guy got off on lack of evidence(?) Sketchy on details here.

An officer named Jose Antonio Verduzco Flores was arrested and charged with Mario's death. He was convicted and sentenced to eight and a half years in prison. But the conviction was overturned a few months later and Flores was released. No one else was ever charged in the case.

http://unsolvedmysteries.wikia.com/wiki/Mario_Amado