He was replaced by Dan Brill, who is still playing with the band. Eliot Engelman left following the release of "Anticore" in 2006 and the subsequent tour with Front Line Assembly in mid-2007, although the band maintained for some time that he had not left, before they finally admitted it. Ethan Novak returned to play guitar during the "PsychoTransHumanoid" 2007 and 2008 tours of the east and west coasts with Cyanotic, promoting the simultaneous release of Acumen Nation's "Psycho the Rapist", DJ? Acucrack's "Humanoids from the Deep", and Cyanotic's "Transhuman 2.0". On 21 June 2012, Acumen Nation guitarist Jamie Duffy died due to an overdose of sleeping pills, which was made public via his personal Twitter account early that morning. The tweet "this is how the end begins...” along with a link to a photo of a plate with three white bottles of sleeping pills and a plate full of the bright blue pills themselves. The photo was later removed, but the tweet remained. On 6 July 2012, a memorial concert was announced entitled "Cold Waves: The Jamie Duffy Memorial Concert", to be held at Chicago's Bottom Lounge on 7 September 2012. Artists appearing at the event included Paul Barker, Chris Connelly, Jared Louche, Martin Atkins, Steven Seibold, Jim Marcus, Jason Novak, and Eric Powell, performing tracks by Revco/Revolting Cocks, Chemlab, 16volt, Acumen Nation, Damage Manual, Hate Dept, The Clay People, and Go Fight!/Die Warzau. Additional artists to perform were Czar, Cyanotic, , and The Final Cut, with DJ sets by Zoltar, host of the satellite radio show "Subterranean" and a former Q101 Chicago and WXRT Chicago radio host. The concert also noted that Duffy had worked at many Chicago Venues including The House of Blues, The Cubby Bear, The Abbey Pub and The Cabaret Metro/Metro Chicago as stage manager and sound engineer, provided engineering and technical support at Chicago Trax recording studios, and had contributed to releases on many different larger and independent record labels including 21st Circuitry, Bit Riot Records, BMG/RCA/D-Tribe Records, Cargo Music/Re-constriction Records, Conscience Records, Cracknation Records, Crash Music Inc., E-Magine Records, Failure To Communicate Records/FTC Records, Fifth Colvmn Records, Glitch Mode Recordings, Underground Inc., Island/Def Jam Records, Katharsis Records, Metropolis Records, MOGworld Records, Tinman Records, TVT Records, Warner Bros. Records, Wax Trax!