City argues that the trial court improperly allowed Adams to testify regarding the City receiving notice of the defect because he had not been properly designated. Adams is Irene Adams’s son and he has never been married. I.S. Adams and Irene Adams are the same person— Adams’s mother. Thus, Gay never designated Adams as a witness. Generally, upon a proper discovery request, a party has an obligation to disclose the identity and location of persons with knowledge of relevant facts. See Alvarado v. Farah Mfg. Co., 830 S.W.2d 911, 916 (Tex.1992) (op. on reh’g). When a witness has not been properly designated, the party shall not be entitled to ... offer the testimony of an expert witness or of any other person having knowledge of discoverable matter, unless the trial l Paso 1993, no writ) (<HOLDING>); Ramsey v. Lucky Stores, Inc., 853 S.W.2d 623,
holding that trial counsels inability to locate witness did not constitute ineffective assistance when defendant only knew witnesss first name and the apartment complex where he believed the witness lived holding that a witnesss prior inconsistent statements are admissible even in the event of that witnesss actual or feigned memory loss holding that counsel was not deficient in failing to call a witness where the defendant never provided the witnesss name to counsel and no evidence existed that counsel had any notice of the witnesss identity holding witnesss business address even though witnesss middle name omitted enough information because party could locate witness holding that a witnesss testimony or an exhibit may not explicitly and directly contain an opinion as to a trial witnesss credibility