Hello i375 and welcome to JustAnswer.
Can you please clarify your question -- you said he was convicted -- was the court date he missed for sentencing?
There is no statute of limitations for prosecuting a case once charges are filed -- the statute of limitations only applies to the deadline for filing charges.
So, if charges were filed, even if he was not actually convicted, and a warrant issued for his failure to appear in court, he could still be arrested on the warrant and the prosecution continued.
What punishment might be imposed now would depend on the circumstances of the original case. A robbery, with nothing more, would not result in a lifetime prison sentence
. The maximum possible sentence for robbery, depending on the circumstances, is 9 years. Additional time can be added for being armed -- the exact additional time depends on what type of weapon was involved, up to 10 additional years for being armed with an assault weapon, a machine gun
or a weapon containing body armor piercing ammunition. So, unless there are additional charges beyond the armed robbery, the maximum possible sentence would be 19 years.
If you can tell me the exact charges and the exact weapon involved, I can tell you more accurately what the potential sentence would be.
Thanks again for asking your question here on JustAnswer.