For future reference, questions of this nature belong on the Plotting Post!

That being said, a confession is not something that is easily rescinded, particularly in the case of murder.  We suggest conferring with your canonmates to see specifically what they would tell the authorities, and then comment to the Plotting Post with more details and some feedback on what you would like to get out of this plot.  In the case that your character does remain under arrest, however, it's worth noting that they will still have access to the network - they simply won't have the ability to send private messages.