Topper?

"Y'know I've seen one of them before." Twigg told the PC as they watched Rufus plug in Mac2's earphones. "Looks like a mobile but isn't. Now where was it?"

"Dunno, sir, never seen anything like it."

"Oh... I know where it was. A young copper was found dead listening to one a few weeks back. They couldn't fathom how he died. Perfectly healthy, but it looked like his heart just stopped beating. The copper who found that woman who tore her skin off."

It finally dawned on Twigg. "Oh shit. That was this bloke's mum. He's going to top himself!"