The Channel 4 soap last week launched a whodunit storyline as Lynsey was found dead at her home following confrontations with a number of the village's residents.
Speaking to Digital Spy at T4 on the Beach yesterday (July 1), show stars Mandip Gill, Steven Roberts, Georgia Bourke, Dylan Llewellyn, Abi Phillips and Jazmine Franks all confirmed that they are clueless over the storyline's outcome.
However, asked if she knows who the killer is, Bowes replied: "Yeah, I do! I'm not telling you who it is!"
As her co-stars expressed their surprise, the Michaela McQueen actress laughed: "I know everything - you know I know everything!"
Bourke, who plays troubled teenager Lacey Kane, noted that there are currently "a lot of rumours going around" about the storyline.
However, Bowes replied: "Yeah, but I know who it is! I'm not even going to tell you lot who it is - I'm not telling anyone!"
Show bosses have so far named Silas Blissett, Mercedes McQueen, Will Savage, Brendan's enemy Sampson, bad boy Walker and Ally Gorman as the main suspects in the mystery.
Fans have also speculated that Doctor Browning could be another possible culprit as he had issues of his own with Lynsey.
Hollyoaks airs weeknights at 6.30pm on Channel 4, with first look screenings at 7pm on E4.