Isidor and Ida were a devoted couple, writing to each other every day when they were apart.
On the night of the sinking, Isidor and Ida Straus were seen standing near Lifeboat No. 8 in the company of Mrs. Straus's maid, Ellen Bird. Although the officer in charge of the lifeboat was willing to allow the elderly couple to board the lifeboat with Miss Bird, Isidor Straus refused to go while there were women and children still remaining on the ship. He urged his wife to board, but she refused, saying, "We have lived together for many years. Where you go, I go." Her words were witnessed by those already in Lifeboat No. 8 as well as many others who were on the boat deck at the time. Isidor and Ida were last seen standing arm in arm on the deck.
When the survivors of the disaster arrived in New York City aboard the RMS Carpathia, many, including Ellen Bird, told reporters of Mrs. Straus's loyalty and fidelity to her husband. Her story struck a chord with people around the world. Rabbis spoke to their congregations about her sacrifice; articles in Yiddish and German-language newspapers extolled her courage; a popular song featuring the story of Ida Straus, "The Titanic's Disaster", became popular among Jewish-Americans.
Although Isidor's body was recovered, Ida's body was not. A cenotaph at the Straus Mausoleum at Woodlawn Cemetery in the Bronx is dedicated to Isidor and Ida together. Its inscription reads: "Many waters cannot quench love - neither can the floods drown it."