In his farewell steamer letter to Dillingham, written as the huge ship was plowing her way down the bay, he drew a picture of a submarine attacking a transatlantic liner. The last lines he wrote on the boat were prophetic of his fate. Ann Murdock had sent him a large steamer basket in the shape of a ship. The lines to her, brought back by the ship's pilot, were:

The little ship you sent is more wonderful than the big one that takes me away from you.

Like most of his distinguished fellow-voyagers, and they included Charles Klein, Elbert Hubbard, Justus Miles Forman, and Alfred G. Vanderbilt, Frohman had frequently traveled on the Lusitania. By a curious coincidence he had once planned to use her sister ship, the Mauretania, for one of his daring innovations. He had a transatlantic theater in mind. In other words, he proposed to produce whole plays on shipboard. He took over a small company headed by Marie Doro to try out the experiment. Early on the voyage Miss Doro succumbed to seasickness and the project was abandoned.

The last journey of the Lusitania was uneventful until that final fateful day. Frohman had kept to his cabin during the greater part of the trip. He was still suffering great pain in his right knee, and walked the deck with difficulty. Occasionally he appeared in the smoking-room, and was present at the ship's concert on the night before the end.

At 2.33 o'clock on the afternoon of May 7th the great vessel rode to her death. Eight miles off the Head of Kinsale, and within sight of the Irish coast, she was torpedoed by a German submarine. She sank in half an hour, with frightful loss of life, including more than a hundred Americans.

Frohman's hour was at hand, and he met it with the smiling equanimity and unflinching courage with which he had faced every other crisis in his life. When the crash came he was on the upper promenade deck. He had just come from his luncheon and was talking with George Vernon, the brother-in-law of Rita Jolivet, the actress, who was also on board. They were now joined by Captain Scott, an Englishman on his way from India to enlist. When Miss Jolivet reached them Frohman was smoking a cigar and was calm and apparently undisturbed.

Scott went below to get some life-belts. He returned with only two. He had started up with three, but gave one to a woman on the way. Miss Jolivet had provided herself with a belt.

Scott started to put one of the life-preservers on Frohman, who protested. Finally, with great reluctance, he acquiesced. There was no belt left for Scott. Frohman insisted that he get one, whereupon the soldier said:

"If you must die, it is only for once."

There was a responsive look and a whimsical smile on Frohman's face at this remark. He kept on smoking. Then he started to talk about the Germans. "I didn't think they would do it," he said. He was apparently the most unruffled person on the ship.