Vision shows Murphy forcefully pushing Caminiti in the chest during the final quarter and the Saints forward responding with a raised forearm that felled his opponent.
Murphy, who later had words with the Saints contingent on the boundary line, will miss Collingwood's Anzac Day blockbuster against Essendon as a result of his concussion.
Caminiti landed at St Kilda during the supplemental selection period and has played a key role in a makeshift forward-line over the opening five rounds this season.
But the 19-year-old's impressive start is set to come to an end, with the incident likely to lead to Caminiti being sent to the tribunal, where the AFL would push for a ban of three matches or more.
GWS midfielder Tom Green is also set to learn his fate on Monday after a dangerous dump tackle on Hawthorn's Josh Ward.
Meanwhile, Essendon captain Zach Merrett will challenge his one-match ban for rough conduct over a dangerous tackle on Melbourne's Tom Sparrow.
Match review officer Michael Christian graded Merrett's tackle as careless conduct, medium impact and high contact.
It was a similar incident to those that resulted in Hawthorn midfielder Will Day (two matches) and Geelong forward Gary Rohan (one match) being suspended last week.
