Lisa Marie Presley's estranged husband Michael Lockwood has told courts he's concerned the singer could "relapse into drug and alcohol dependency" following her son's tragic death. Lisa Marie's 27-year-old son Benjamin Keough took his own life earlier this month, and her former spouse Michael has now said he believes the tragedy could push the 52-year-old singer - whom he split from in 2016 after a decade of marriage - over the edge.