What do Kelly Rowland's lyrics of 'Stole' mean?

What do the chrous lyrics of this song mean? 'Mary has the same sized hands as Marilyn Monroe, she put her fingers in the imprints of Mann's Chinese Theatre show, should could of been a movie star, never got the chance to go that far' and the lyrics about the boy Greg, I never understood these lyrics, I may be wrong but do these lyrics mean that 'Mary' and 'Greg' never got to do what they wanted to do in life because the boy's suicide affected them so much?
 
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